Ahrefs in numbers

Ahrefs team takes great pride in collecting, processing and storing large amounts of data for search marketing professionals.

We crawl the entire web 24/7 (much like search engines do) storing petabytes of information about live websites — how they link to each other and what keywords they rank for in search results.

We process large amounts of clickstream data to maintain the world's biggest third party database of search queries with refined monthly search volume and advanced keyword research metrics.

Browse this page to explore the scale of data that powers Ahrefs marketing tools.

Content index

Our content index is basically a mini search engine. You can search for any word and we'll return all pages, mentioning that word with our useful SEO metrics attached to them.

Every 24 hours we discover

5 million new pages

Every 24 hours we update metrics for

72 million pages

Total content index size

855 million pages

Full update

Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.5 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (549 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

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Ahrefs tools are powered by seriously Big Data. Check out their numbers.

Backlink index

Ahrefs boasts the world's largest index of live backlinks that is updated with fresh data every 15-30 minutes. We use this backlink data to calculate our proprietary metrics: Ahrefs Rank, Domain Rating & URL Rating.

Server fleet

Above anything, we're proud of our backend infrastructure. All existing solutions couldn't keep up with the volume of data that we operate, so we had to custom build the larger part of our software infrastructure in-house.

2.5K Servers

38,000CPU cores

256TBRAM

25PBHDD

2.5PBSSD

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Ahrefs tools are powered by seriously Big Data. Check out their numbers.